The next time that someone tells you that appellate jurisprudence has changed a lot during the past half-century, here's Exhibit A of your rebuttal.
Due process and state action requirements have changed a ton since the Warren Court. But this same opinion could easily have been written back then. Something I can almost never say when I read opinions from the California Court of Appeal.
That's either a good thing or a bad thing, depending on your view. But it's definitely true.
The times they aren't (always) a-changin'.